Modbus Functions; Supported Functions; Parameter Addressing; Watchdog Function - KEB COMBIVERT G6 Instructions For Use Manual

4 | MODBUS functions

4 MODBUS functions
4.1 Supported functions
4.2 Parameter addressing
4.3 Watchdog function
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The KEB G6 MODBUS interface supports the following functions defined in the Modbus
standard:
• 3: 'Reading Holding Registers'
• 4: 'Reading Input Registers' (for KEB, identical to function 3)
• 6: 'Preset Single Register'.
• 16: 'Preset Multiple Registers'.
These functions only support 16-bit access to parameters.
Therefore, two additional functions for accessing 32-bit parameters were created:
• 100: 'Read Registers 32':
Reading multiple 32 bit registers (indirect set addressing through Fr09)
• 101: 'Write Registers 32':
Writing multiple 32 bit registers (indirect set addressing through Fr09). For those func-
tion the datagram building is similar to 3 / 16 functions.
The addresses of the parameters (register) are divided into different groups. Each of
those groups has its own accessing method:
• 0000(hex)...1FFF(hex):
This group is defined to access to mapping parameters. Parameters are set up to be
redirected to the mapping list.
• 2000(hex)...5EFF(hex):
In this address area the parameters of the inverter control board are mapped by a fixed
algorithm. Please keep in mind that in this address area access is done with indirect
set addressing (with Fr09). This means when writing/reading one parameter in different
sets you have to set the set indicator (Fr09) previously before access.
• 5F00(hex)...5FFF(hex):
This block consists of the operator parameters.
The MODBUS driver supports fieldbus monitoring. With regard to the settings Pn05 and
Pn06, the watchdog is controlled via the
This function only starts after the first valid datagram exchange.
KEB Automation KG
MODBUS communication.
ma_dr_g6-modbus-20332669_en